Receivables, Net (Tables)

3 Months Ended

Dec. 31, 2017

Receivables [Abstract]

Summary of Receivables

Receivables, net are summarized as follows:

(in millions)	December 31, 2017			September 30, 2017
Billed	$	1,118		$	1,055
Unbilled	492			461
Less progress payments	(84		)	(78		)
Total	1,526			1,438
Less allowance for doubtful accounts	(13		)	(12		)
Receivables, net	$	1,513		$	1,426